When Should You Start Remortgaging? A Step-by-Step Guide

Everything starts with two facts from your mortgage offer or annual statement: when your current deal ends, and what early repayment charge applies if you leave before then. ERCs are usually a percentage of the outstanding balance that steps down over the deal — leaving a year early can cost thousands, while leaving a day after the deal ends usually costs nothing. The most common and costly mistake is simply not knowing these dates.

Many lenders allow you to secure a new rate some months before your current deal ends, with completion timed to the day the old deal finishes. Starting the review early costs nothing and removes the risk of landing on the SVR because the paperwork ran late.

The standard variable rate is the lender's default rate, set and varied at its discretion. It is almost always higher than the deal rates available to you, and it can change at any time. The gap between your deal rate and the SVR, multiplied by your balance, is the monthly cost of doing nothing. For most borrowers, even a short spell on the SVR costs more than the time and modest fees involved in arranging a replacement deal.

Your existing lender will usually write to you with product transfer options as your deal ends. Treat those offers as one quote among many: compare them against the wider market before accepting. An advisor can run that comparison and will also tell you honestly if your existing lender's offer is already the best available.

A remortgage to a new lender is a fresh application: your income, outgoings and credit history are reassessed against current criteria, and the property is revalued. The valuation matters more than people expect — if your home has risen in value, your loan-to-value improves and you may qualify for meaningfully better rate bands. If values have fallen, the reverse can apply, which is worth knowing before you commit to a route.

The legal work transfers the mortgage charge from the old lender to the new one. Many remortgage products include a free legal package or cashback; check what is actually covered and the likely timescale, because slow conveyancing is the most common reason a remortgage misses its target date.

Remortgaging can release equity for home improvements, a deposit for another property or other substantial plans. Lenders will ask the purpose, and affordability is assessed on the higher balance. The key discipline is to compare total cost: borrowing extra over a 25-year term at a mortgage rate may cost more overall than a shorter, higher-rate alternative — or than waiting and saving.

Life rarely stands still between deals. Income may have risen or fallen; you may have become self-employed; credit events may have occurred; the property may be worth more or less. Each change shifts the balance between routes. Where circumstances have become more complex, staying with the current lender on a product transfer can be the pragmatic option because a full reassessment may be avoidable; where they have improved, the wider market may now offer you much more. Either way, review — do not assume.